I have the latest versions of gPhotoShow Pro and also Wallpaper Slideshow Pro. I'm using gPhotoShow, quite succesfully, as my screensaver. Although I have set gPhotoShow to set the last image on the screensaver I would really like to utilise Wallpaper Slideshow Pro to select a random wallpaper.

I did try to run them both at the same time but, although gPhotoShow ran ok, WSP didn't change the wallpaper.

Would anyone have any ideas as to whether I can run them both in order to get the result that I'm after?

Of course you can use them together but by default WallpaperSS doesn't change wallpaper while the screen saver is running since usually you can't see it. If WallpaperSS never changes wallpaper probably it is not configured correctly.